The more one presupposes that his own power will suffice him to realize what he desires the more practical is that desire. When I treat a man contemptuously, I can inspire him with no practical desire to appreciate my grounds of truth. When I treat any one as worthless, I can inspire him with no desire to do right.

Part III : Selection on Education from Kant's other Writings, Ch. I Pedagogical Fragments, # 15 - The Educational Theory of Immanuel Kant (1904)